Question

Which three of the new slave states where most important to the growth and expansion of slavery

Answer 1

Florida (1819)  In 1819, the United States signed the Adams-Onis Treaty with Spain, making Florida a part of the United States.  

Missouri (1820)  Missouri was added to the United States in 1820, as part of the famous Missouri Compromise.

Texas (1821)  In 1821, a man named Stephen Austin led the first American families into Texas, which at the time, was still claimed by Spanish Mexico.  

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